From 1918 the constituency consisted of "The Calder and Suburban County Districts, the burgh of Dalkeith, and that part of the Lasswade County District which is included in the extra-burghal portions of the parishes of Dalkeith and Inveresk."
^Craig, F. W. S. (1983) [1969]. British parliamentary election results 1918–1949 (3rd ed.). Chichester: Parliamentary Research Services. p. 638. ISBN0-900178-06-X.